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Help me to identify this plug please....

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I'm trying to reinstall my stock Porsche stereo, after some butcher (previous owner) installed an aftermarket head unit.  I think I have everything sorted, but found this yellow plug in the dash.  I can't find anywhere in the Becker head unit that it will fit.  Where does it go?


Oh, 2003 Carrera C2 Bose.




Edited by JTT
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Thanks Kevin!  That seems to be it!  


Ok, now I have the head unit powering up, channel selector and CD changer seems to be working....but no sound!  Arrgghh!

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It sounds like someone did some major butchery on your car, so you may have to run down several possible causes.  The first one that comes to mind is that the amp in not turning on.  I would start by checking the fuse box and see if the amp fuse is there or is blown.  There should be a piece of paper in the fuse box cover and that will tell you which fuse is for the amp.


Then check to see if the amp wiring is intact.  There will be one wire that is the amp turn on wire and it could be damaged or disconnected.  Unfortunately, I'm not as familiar with the 996 model year changes as I am with the 986.  Is your head unit a CDR 23 or a CDR 220?

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Mine is a CDR 23.  Yeah, I think there has been an aftermarket installed, removed, replaced original, then another aftermarket installed.  I discovered a whole second harness not connected at either end, from what I presume was the first aftermarket install.  I've removed this to avoid confusion.  What I presume was the second aftermarket install, tapped into the harness plugged into the head unit and ran independent wires back to the amp and connected into what I believe is the speaker outputs from the amp (essentially bypassing the amp).  I "believe" I have all the original wires back in place in the proper connectors now.  There is power getting to the amp in at least one point as I was probing around with my meter last evening.  What's odd is the colour combinations coming out of the head unit, do not "seem" to coordinate with what is going into the amp.  The investigation continues.

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With that amount of modification, it difficult to make any useful suggestions.  I have limited experience with the CDR-23 and MOST system.  I helped a co-worker replace a blown fuse on the back of his CDR-23 and it seemed that there was a fiber optic cable on the back that replaced several of the wires on my CDR-220. 


Is it possible that the previous owner totally removed the fiber optic cable and replaced it with copper wire?

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Everything is back to stock, including the MOST cable.  No sound  :cursing:   I'm figuring the amp is toast, but don't have any idea how to test it.  Open to suggestions.  Head unit powers up and shows no errors or issues, just nothing out of the speakers.  Oh, and I know the speakers are working, as the aftermarket head unit was tapped directly into the outputs from the amp to the speakers.

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  • 3 months later...

Did you sort this? I had the cdr23 replaced years ago and recently decided to upgraded myself again.

To my horror the speaker wires had all been cut! Rather than add a connector to the standard block! This is all in the bonnet before the amp.

I've now replaced the factory amp and ran new lines from the headunit.

Sent from my iPhone using Tapatalk

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I used a Kenwood KDC-X300 HU and a Clarion XC 2110 compact mono amp for subs. Amp is mounted to the original amp mount, with enough room for a second compact 4 channel should i decide to upgrade.

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